Hi, I just got (not bad, I think):

CleverHosting.com

PremiumDNS.com

How much can I sell them for? Any expirience?

PremiumDNS.com is very good......

I doubt you could find a buyer for either of those domains for anything more than reg fee, unless you have a design to go with them or something with some novalty value.

They're both decent domains, but as Matt said... without a developed website you won't get much (if any) more than the reg fee.

But, to develop a so so website and search engines submition, I need invest more ( about $200 - $500 as I estimate), and have customers also. And then, how much can I sell it for? over $500 ? Or I should keep it and continue my business with what I develop? (Sorry if those are stupid questions cos' I'm a newbie)

Correct it would cost money to develop, but you would sell it for more. Unless you get a first class domain these days then you dont make much money buying and selling them undeveloped, the market is flooded.

So, I don't have enough money to invest know, I better quit domain business? or buy and sell as same price as reg fee like an game for interesting?

The domain business ain't what it used to be....

I own cleverhosting.co.uk and would love to purchase cleverhosting.com.

I'd offer double the going rate for a .com domain if you're willing to sell.